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426/1 CEEFAX1 Fri 2 Dec CEEFAX.TV
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POLLEN INDEX
The Pollen Index is calculated for the
BBC by the National Pollen Research
Unit.
Tree pollen affects about 25% of hay
fever sufferers. The grass pollen
season runs from the middle of May
through to the end of July, and affects
about 95% of hay fever sufferers.
Symptoms may start when the index is
low, and will affect all hay fever
sufferers when the index is high or
above.
From the BBC Weather Centre

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